Painting fine Scilly isle, but not the capital (6)

I believe the answer is:

fresco

I'm a little stuck... Click here to teach me more about this clue!

'painting' is the definition.
(I know that fresco is a type of painting)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fresco that I've seen before include "Painting done in wet plaster" , "Mural painting" , "Forces (anag) - wall painting" , "Artistic work" , "Mural painted on wet plaster" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.